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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '658b2754e42373d2fd0f96fd644b2d209519b73ad895697cf7a55def89e52af5' 
  AND token = '4SG1SLYXswZP2OJwb2RUyb047/7WFDcU4rHj6V5boN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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