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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35f2f042a056601b056dfbf5b93bbad1fbb2ef174b7c31a89f22869602a5bcba' 
  AND token = 'Tu3Wq5ul7GvsPa/1JU4A8tyQdgR4A0AxtmDEgE/M2CU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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