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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38aed44c0a4c232594164386256a0406e892f45edcbe47287121a0e67824276f' 
  AND token = 'SgPWjOnFnsVM0yIua9Gk2Zz8tm475rv4M/jkX7iC9ZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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