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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a615e57a41c60a8ad2e5c3285ab948c25a9c24021f543f948f6fc0e56ade2f30' 
  AND token = '6nTq8Yvf5r8wKRulDRGQF0RoAzGTu8MhY1WgOp6Tc+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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