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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0d616246dbe7484bd2f61a7ece11f1d06c8f2c21c0b1647cc15c43f79a652e5' 
  AND token = 'Fn5YqkCdDD0Amf74e2ACriMVPZLhKhBF/1jdF6SKN/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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