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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b6904c00ad3e52692abaf78b87ab3ee9a24b0502aae8f8b9fcfd93919858cca' 
  AND token = 'SiaGra9C2J8iKnQHEYt6CrDHn4tgLdia9nPsYSEyOs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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