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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15313252a9f999a37422e84e93df9e0be7a1073cee3291b74dc40b711b2af717' 
  AND token = 'aL/iDCkljcqhcmOQ18LNbk4PFqX2qrE3ylolFG8NVgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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