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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '996e11e2f2b9cf84aa6675dfbf3bca0b5239f48d0b7e120d3d868656d8fbdb87' 
  AND token = 'ZLEyKOIV/s616uDcgQdVaeT7JLpQs0pKcMrMTmQuHwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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