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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '917cc904eef8911f101e2eebf0365d8aaea3a90a60e99b1fc80f242fdee2c5ff' 
  AND token = 'h0yCspyNh9dpSscQW/5RA5+0JzJfKw6qDNu66DqKSfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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