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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06bc6df20d61facdac9c1b728048ea1d4b1cb0216657536fb2f4782e1d2a6184' 
  AND token = '+SyoGRefVBSdLp5k31Pm3Hliq9JOZGxOrL4WkvYN7C4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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