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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a824efc20e8d2668156f0fc7a72992b5812e217d782b18d11824ae58e0e4b2f' 
  AND token = 'MmfLDXAkw/meY8XrLUQ9iCjYGdyCwRZmEGmBNhpIkOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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