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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff6770e62ab2957bbdf047c96462e541909a1153a4cff046d2ff08fafb4595a5' 
  AND token = 'Y5HhQFI8tWSFVME7sOSumI+FaKqt+Tl/k9aLKKX17eU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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