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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '031b08ff6cffef99282381e44a4e992d51f7c7d125d9d51ed58eef81807f452b' 
  AND token = '89pBants88rkD+SNv6lpEtda5qPCgtQuxudPiE8Zyyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

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