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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b317424e308e17771ec95ac0d980d0cc3b617e4ecbb7058853d75ef3d65997b' 
  AND token = 'uz3cNT4WQMch5k3DJG0xpu5MRNHJMXoykEp0iJUCC58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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