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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c04d18a64dc7c717913f3f6c6d3ac21b9bc001e70abbf2a6151094e90a44e7a9' 
  AND token = '+imQPtJCkA894oUbSD7GWR3SpyHQmbA+NwXjEUDHcp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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