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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b47983f9dac1cc4d29cb00c89fc0c53f6c8c4f6458842bf1f83287fe6084e9e' 
  AND token = 'lt4+danSUbyT1Xqfnk78CIrcSGLhF7onHOjBA9GW4CI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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