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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e832934fa407c2f5269e6b0bef2b31b9cef13ce775087cab1d5dc1b29d80a2e6' 
  AND token = 'NfUjLnke61HRIeXu0vY0gVg1rA4hwBMQEN/d9JrmncM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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