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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a97e94b0bed02dfa62f5a4ab858fbe66d4b9359e3abded467927af3922bc0155' 
  AND token = '7VrUpEVKgWKtjnUZ7Wb25w2Qssnv0W2sLnAPen7bKUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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