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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5206feada146282a803cf9d8126a984327d4ef0e621472307c978e25701f6bb' 
  AND token = 'pTi+9H6PxaNZUmmYSDSQqIxdz5lowlBMxw33A2Vu9SI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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