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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '276f5cdfa9eadacfe87cc7b76eaa123835a0b84f071fc99ec3f1a0f6dba92050' 
  AND token = 'RG7ig/qOl8XdF4u7fHo7msG7CPV3o9Ke/Nk34cT56Mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00087

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}