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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd668e0dd7bf6970cd5e211c62c38a37706fb6750a844a7cd6ac5fd0edb8e2437' 
  AND token = 'Qt7jj5dR7QWH3ALL7PqbEON0tjH0yHvWy2coTIK/Wnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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