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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd56ed5d8a7e43f341028d05294838133283d3620d922608552fa29c98d5c597e' 
  AND token = 'LAeGrXsPbfw7fk4Bneb55ZhcEnMMsHqm4d8gvSLatXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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