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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f7c65c4232bfdf62886a75f7aeb3645e5f0bf66f318cf041d5a2edc6342e594' 
  AND token = '1eofEmbrhvp3FUOJ56IpJWQee6i6MzA1hw+OB8WpQ14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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