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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ca3ebc9bf12118a402c13eff0a5350d961afa813f8133401b9f904f78f340b2' 
  AND token = 'U43OrQ1G1TC/HMdtzibUWU9G2Fqj6QfrfBTIzGPVfuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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