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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be0134dc2bce22f365f0ef033e179fac9001ebeb340fe55eb4dcb071c9c40db9' 
  AND token = 'TJdLUulW0P3ZJditr82O88XKCNCA+PySwY+YzFWW97I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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