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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef2a09a9d5b6440b25eea4f036ceb31f2c4baad6494eef8b1925160c3d4fcf7f' 
  AND token = 'mI0XxzSJkwM9Ei/hE04xQ4owIuZYfy/N0Sgff6o2lAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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