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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82877dc7b0b58b76a01e842a086954db753b5b6a3b812bda86fc1a4a0a7ac58c' 
  AND token = '/0TlAcvALrOVMDW9WTAJRf78LoysunhD+c3HXVjU/Jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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