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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f95f07930fc1edaedffb34bddf518a936da0c1a6fcac738e93de45645d598f1' 
  AND token = 's+oD+0kdZAEuP1jvbEvx8tXBYAbQ/8qwmaJT/OH6t6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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