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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c90cd5525238393bcc5e435f164c3aad380324df3f7cab1e1dcb3325c0a74b8' 
  AND token = 'oxv81kEbhqRQx+6A05Q1Z6Zm06nCLHxkUnC0gHsKgVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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