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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f02a9028b51b55df504c8f07f49fd15da70c2fa575bf14a65c897c67f9b544b' 
  AND token = '8cayXbaNG26tQPdWzM2I89bQn6kBucwuPTwXKw01KtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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