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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29fbaa4659f1a561a985a5cabfe20da68a2e94746e056cdb89d498877c140805' 
  AND token = 'rL/PetLCeNJjwhK4Yj2oqPCddamuNDr1on+ZsWSWD8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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