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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '861adf21f1fdc6da38473f2835684ecaaba4b25afc76ed5e39a0d62d9c2eacaf' 
  AND token = '9Kxj0l8IkT4KiTKG+0GS0RDR/REr45V9ZKM2UV7Gl6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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