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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d0e66dd1656ab43f32eda01225ca2899c96e1629bcf5e6b30c51f19b5e99c44' 
  AND token = 'gnt5cJp/eWJZaFCovhLGNMYKFbUhCqEs2ZqLLFCiovg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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