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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7947ccb3b8d84a98d915802c748ffc43043414a60dd16e905df3d1e0c82f6994' 
  AND token = 'TxN2m0yX7zYI6WI9vOI1/Qv1l/YEIYa44Uj1dhl0hSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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