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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e0581de3db39da32bf495fe1214a1a3f6d257304464a90600ac8e12c2ad8923' 
  AND token = 'RrNAhtJrGR9EaUuvT8y/+mHrcjr5cfdIJgift28Ua2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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