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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffee5b4fc0935feefc3abbcbe93c0b0989e0060b22d784ca3053342fb8dd8bbe' 
  AND token = '0Af+3NyNNpulYlZsQJSIM2uZNVxXW5/dxCajzzyug1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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