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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a88faffdd46a329e51e073323d37a1903caacaa8f23776ed26088d893f118ed0' 
  AND token = 'E63dDR+VCRrHlTLxsn1tYSx1ktxJ9DjxABUhr8s8YvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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