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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c2bb97b75c0b9b73b7964f18f739b7ad4df106b89c0e461feba6648ae50d4d8' 
  AND token = 'SgGycXBEgCKsWsN5zwP1wLy6MvAG8vVS5bUDzEFYWwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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