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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a0203839074b56e3c7b7e040a1a40697ff786af0a469a192e9f0b7f7ae2a989' 
  AND token = 'm+LyjBO9jz1TAatAgZ1iLAUFz2heO+9vgasL0Bh+08o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00105

JSON explain

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