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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4165977d5ea46f989f83a46c844b3cad0e828efd9193a036f12904940d0e6c7c' 
  AND token = 'tMXvsqqW02/P8cNAOgXjHL+aH2Bz4Ig3zgndVOMDvuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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