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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3be697a86adc55c022636ca2cba1713d7246bdab5cc466c9a84053c50cf4afc2' 
  AND token = 'Hu/rN+DGWBFA/IisCTnazul4Y0IIWawy1439vbDx8G0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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