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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '282f667d4ad4bad7dcb5e765c140aa0fd558f3268ac35de93dcd1c3e3c5bb96a' 
  AND token = 'L/XCH7yz3Myz4AedRChWW1c04nhQ5Mk6mEo93Rxe7P0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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