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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da2687fe4e22f4a835ce53d776ec40bbb9af03c49abdea27e6f5c593c8feea0e' 
  AND token = 'nMxXYCb1GHTY7zl+Wvm1pM/b/VkM0ORNJuU+8CA/adk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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