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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb7b020bf01865798b420ce2f2898aab6056a1335d714f8700dda10bcbafe387' 
  AND token = 'eiW2AML5XCr2xCEC+gFrMhVHAMzM603KaX9RpdY8Mro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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