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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e382fb20caeb5e12a5654bf1b2e34d9ecdda6e7fa3ae753ae5f4f7f36288d8a3' 
  AND token = 'ZkEvL3K349u9eqjkzFPJJtc0sKDeVzQbaGj//GW8KR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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