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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2d176eb63fb33853bc3f38b00f13f18a41b8d754f5c8a9e941e1ef17af67830' 
  AND token = '8Mxl12vQDQuKGujuuAw/DdChQ6K40N9qHoBQ5fZPPF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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