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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '629855e62c04dcfff448305148e628c7feb7af929b9adb39757018e37eb651e9' 
  AND token = 'trxIQK5cQeIuiRR/1Dpfta2X32NiTdFIiGYeYI2zUXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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