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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e752c08ccd91315b62fcf6cc597e9e51cc135509d4498c2a00a492ae8f9099d9' 
  AND token = 'BEwlxF6QfCP6IyQyX/0i6043ce6BR5naUwnPGWiRrN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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