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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8fc6734511080557e497307fb822c28aef27c952b2e5a4226e4a7f49d27bfbd' 
  AND token = 'iSeeF7/F7zIUb2b1gCSwRUm9WNNARuhQA1DIzBQ/AoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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