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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '075a07463ee2e67b30286c32e82b1a15bbc2461aa3c31e7df6ccb52549bc34d0' 
  AND token = 'BzxL5bvAXITtrtMqMEEZpv2aZmUtTGXzPT3JQS7gD5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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