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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33f9bba4602ee3d221b63b82392d8b00f08c7f32c1485e772d1384b1409c5f02' 
  AND token = 'EQ0JXOooBeqvYc5ubt6T4XGTrzt/7047KcBGxljH3No=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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