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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aadbfe95a9c02299ef0989e885f09505f47b2221e566f901f2adc8eae30976b' 
  AND token = 'MwL1BotnPXy7v/QVbfOms6NQQ4FBnNe3PabJKU0Kgyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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